The first in the WRT series, the WRT54G has the most firmware options.DD-WRT: Based on Sveasoft's Alchemy, Many Features (Latest Version: v23 SP2)Freifunk: Based on OpenWRT, Accepts Software Installations (Latest Version: 1.0.5)HyperWRT: Mininal extra features, fast, for most users (Latest Version: 2.1b1)Linksys: Official Firmware, least features, most stable (Latest Version: 4.20.7)OpenWRT: Advanced firmware, Linux experience required (Latest Version: White Russian RC5)Sveasoft: One of the most popular, many features (Latest Version: Alchemy)TinyPEAP: Based off Sveasoft's Satori, this stable RADIUS server is great for advanced users. (Latest Version: 2.50)Thibor: Based on HyperWRT with more featuress. (Latest Version: 15c)Ewrt: Allows users to create hotspots (Latest Version: 0.4.3) - DISCONTINUED